Blurred vision means a reduction in visual sharpness or difficulty seeing fine detail. It can affect one or both eyes and may be temporary or persistent. This guide explains common causes, how clinicians evaluate blurred vision, warning signs that require prompt attention, and which specialists are typically involved.
Reduced clarity can arise from refractive errors (myopia, hyperopia, astigmatism), need for an updated glasses or contact lens prescription, presbyopia, or surface problems such as dry eye and conjunctivitis. Structural changes like cataract, macular disease, glaucoma, diabetic retinopathy or retinal detachment also cause blurred vision. Neurological causes and visual symptoms associated with migraine are additional possibilities.
Seek immediate medical attention if you experience sudden or rapidly worsening blurred vision, particularly when it affects only one eye, or is accompanied by severe eye pain, light sensitivity, eye redness, sudden floaters or flashes, or neurological signs such as weakness, difficulty speaking, or sudden dizziness. Sudden vision loss or severe pain merit prompt emergency or urgent ophthalmic evaluation.
Evaluation typically begins with a medical history and measurement of visual acuity. Common tests include refraction, slit-lamp examination, intraocular pressure measurement, dilated fundus examination and fundus photography. Optical coherence tomography (OCT), visual field testing and, when indicated, neuroimaging may be used. Systemic checks such as blood glucose or blood pressure assessment are done if a systemic condition is suspected.
Regular eye examinations and wearing prescribed corrective lenses help maintain vision. Take regular breaks during prolonged screen use (for example, the 20-20-20 rule), manage chronic conditions like diabetes and hypertension, eat a balanced diet, avoid smoking and get regular exercise. If vision changes persist or worsen, seek professional evaluation rather than self-managing.
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